Because you have Itunes you should subscribe and download the Talkingreef podcasts... just type talkingreef into the search. Start at the beginning and listen to them all, there is a TON of info that you can listen to for free!
What was the
PH when you tested it? Acceptable range is 7.8-8.4. If you are with in that range, leave it alone.
I wouldn't add any other fish just yet. Do some more reading and research first. With a 30 gallon tank you need to select fish that will outgrow or not get stressed out from being in small tank. You may want to look at something like Firefish, small Gobies, Chromis, smaller Wrasses, etc., but not all at once! Take your time or you WILL BE DISSAPOINTED.